Injection unit of electric injection molding machine

An injection unit of an electric injection molding machine, comprising:

• a heating barrel having a nozzle at the leading end thereof;
• a screw, the leading end side of which being incorporated in the heating barrel;
• a front plate supporting the tail end of the heating barrel;
• a rear plate arranged behind the front plate opposite to the front plate;
• tie bars spanning a space between the front plate and the rear plate and connecting both together;
• an intermediate plate arranged between the front plate and the rear plate, moving along the tie bars in a back-and-forth direction and rotatably supporting a vicinity of the tail end of the screw;
• a rotationally driving mechanism mounted to the intermediate plate and configured to rotate the screw;
• and
• ball screws mounted to the rear plate and configured to drive the intermediate plate in a back-and-forth direction;
• wherein the nut of each of said ball screws is rotatably attached to said rear plate, through holes are formed in said intermediate plate, the leading end portion of the threaded rod of each of said ball screws and the leading end portion of the nut are inserted in each of these through holes, and the leading end of the threaded rod is connected to the front surface side of said intermediate plate.